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About RIEC Introduction Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets History Chronology International Activities COE of International Research Collaboration How to study at RIEC Organization Computing System Platforms Division Solid State Electronics Dielectric Nano-Devices Materials Functionality Design Spintronics Nano-Integration Devices and Systems Quantum Devices Innovative Spintronic Device Computing Information Theory New Paradigm VLSI System Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Applied Quantum Optics Group Advanced Wireless Information Technology Information Storage Systems Ultra-Broadband Signal Processing Quantum-Optical Information Technology Network Architecture Environmentally Conscious Secure Information System Human and Bio Information Systems Division Electromagnetic Bioinformation Engineering Advanced Acoustic Information Systems Visual Cognition and Systems Realｰworld computing Nano-Bio Hybrid Molecular Devices Interactive Content Design Soft Computing Integrated System Research Facilities Laboratory for Nanoelectronics and Spintronics Laboratory for Brainware Systems Research Center for 21st Century Information Technology（IT-21 Center） Common Research Facilities Flexible Information System Center Fundamental Technology Center Management Office for Safety and Health Promotion Office Ad-hoc research groups Co-creation Research Center Furukawa Electric x Tohoku Univ. Co-creation Research Center for Photonics Integration Staff Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Application System List of Research Projects Description of acknowledgment RIEC Annual Meeting FY2023 RIEC Annual Meeting FY2022 RIEC Annual Meeting International Exchange International Activities COE of International Research Collaboration Information What’s New Award News Press Release Event RIEC Annual Meeting Projects Type-T (Study Groups on Electrical Communication) Lecture Symposiums Nation-wide Cooperative Study Group Archives RIEC NEWS WEB Latest version of the Archives RIEC, Tohoku University : Back number Annual Report of RIEC : Back Number RIEC NEWS Back Number Other Call For Proposals RIEC Administrative Office (Japanese Website) Educational Activities 日本語 English About RIEC Introduction Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets History Chronology International Activities COE of International Research Collaboration How to study at RIEC Organization Computing System Platforms Division Solid State Electronics Dielectric Nano-Devices Materials Functionality Design Spintronics Nano-Integration Devices and Systems Quantum Devices Innovative Spintronic Device Computing Information Theory New Paradigm VLSI System Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Applied Quantum Optics Group Advanced Wireless Information Technology Information Storage Systems Ultra-Broadband Signal Processing Quantum-Optical Information Technology Network Architecture Environmentally Conscious Secure Information System Human and Bio Information Systems Division Electromagnetic Bioinformation Engineering Advanced Acoustic Information Systems Visual Cognition and Systems Realｰworld computing Nano-Bio Hybrid Molecular Devices Interactive Content Design Soft Computing Integrated System Research Facilities Laboratory for Nanoelectronics and Spintronics Laboratory for Brainware Systems Research Center for 21st Century Information Technology（IT-21 Center） Common Research Facilities Flexible Information System Center Fundamental Technology Center Management Office for Safety and Health Promotion Office Ad-hoc research groups Co-creation Research Center Furukawa Electric x Tohoku Univ. Co-creation Research Center for Photonics Integration Staff Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Application System List of Research Projects Description of acknowledgment RIEC Annual Meeting FY2023 RIEC Annual Meeting FY2022 RIEC Annual Meeting International Exchange International Activities COE of International Research Collaboration Information What’s New Award News Press Release Event RIEC Annual Meeting Projects Type-T (Study Groups on Electrical Communication) Lecture Symposiums Nation-wide Cooperative Study Group Archives RIEC NEWS WEB Latest version of the Archives RIEC, Tohoku University : Back number Annual Report of RIEC : Back Number RIEC NEWS Back Number Other Call For Proposals RIEC Administrative Office (Japanese Website) Educational Activities 日本語 English Computing Information Theory HOME > Research Activities > Computing System Platforms Division > Computing Information Theory &＃62;&＃62; Computing System Platforms Division Computing Information Theory Researcher [ Professor ]Keisuke Nakano[ Assistant Professor ]Kazuyuki Asada[ Assistant Professor ]Kentaro Kikuchi Group Web Site https://www.ipl.riec.tohoku.ac.jp/dokuwiki/en/start Research Activities Our ultimate goal is to fill a gap between humans and computers. Humans describe a program for instructing computers what they should do. However, there is a gap between humans and computers. A human-readable description may put a burden on computers due to lengthy and inefficient execution, while a computer-oriented (well-tuned) description may put a burden on humans due to lengthy and inefficient development. Our research goals are to derive a well-tuned program from a human-readable description and to certify that well-tuned complicated programs work as humans intend. Computing Information Theory(Prof. Nakano) Research topics Theory of tree automata and tree transducersProgram transformation and program verificationFormalization in proof assistantsElucidation of computational behavior over combinatory logic Our research focuses on formal tree language theory which succeeds in having many nice results for abstracted programs and computations. Specifically, we are investigating and extending a theory of tree transducers, that is a formal model of tree-to-tree transformation, to develop a framework which enables to automatically derive efficient programs and statically certify properties desired by programmers. Additionally, we employ a proof assistant tool that can check the correctness of the proof by computers.We also study semantics of programming languages. This gives also a kind of abstraction of programs, which keeps all the semantical properties of programs, while the formal language technique above abstracts just specific aspects of programs, depending on purposes. Through the abstraction and further mathematical analysis, we clarify the essence of a target programming language. This includes denotational, operational, axiomatic, and categorical semantics; and is applied to a theoretical design of programming languages, as well as to program verification by combining with the formal language techniques above. Fig.1 Performance Improvement by Program Transformation Fig.2 Formalization of Mathematical Juggling in Coq 研究室のようすThe state of the research About RIEC Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets Chronology How to study at RIEC Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Cooperative Research Projects System Description of acknowledgment Information What’s New Archives Link Call For Proposals Link Access Contact Us Sitemap Organization Computing System Platforms Division Information Communication Platforms Division Human and Bio Information Systems Division Research Facilities Common Research Facilities Ad-hoc research groups International Exchange International Activities COE of International Research Collaboration RIEC public relations RIEC Newsweb RIEC Youtube Channel RIEC People 東北大学電気通信研究所Research Institute of Electrical Communication Tohoku University 〒980-8577 宮城県仙台市青葉区片平２丁目１−１2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN © 2019 Research Institute of Electrical Communication Tohoku University All Rights Reserved.